Hydration in Dubai's Heat: A Practical Guide for Runners

Sweat rate in Dubai's summer commonly hits 1.5–2L per hour for trained endurance athletes. Replacing only water — especially without sodium — can cause hyponatremia, which presents identically to dehydration but is treated very differently.

Calculate Your Sweat Rate

• Weigh yourself nude before a run
• Run for 60 minutes, recording any fluid consumed
• Weigh yourself nude after
• Sweat rate = weight lost (kg) + fluid consumed (L) per hour

Most runners are surprised — sweat rates of 1.2–2.0 L/hr are normal in Dubai's heat for moderate-effort running.

What to Replace

• Sodium — primary electrolyte lost in sweat. 400–1200 mg per liter of fluid is the typical replacement range.
• Potassium — lost in smaller quantities. Often included in commercial mixes but rarely the limiting factor.
• Magnesium and calcium — helpful for cramping protocols but not acute hydration.
• Carbohydrates — for runs over 75 minutes, 30–60g per hour improves performance and protects pacing.

Practical Hydration Strategy

• Pre-run — 500ml fluid with electrolytes, 30 minutes before
• During (under 75 min) — 150–250ml every 15–20 minutes with electrolytes
• During (over 75 min) — same fluid plus 30g carbs per hour
• Post-run — replace 150% of weight lost within 4 hours, with sodium

Products That Work

• LMNT — high-sodium (1000mg), no sugar — pure electrolytes
• Tailwind — carbs and electrolytes combined, easy on the gut
• DIY mix — 500ml water + 1/4 tsp salt + 1 tbsp maple syrup. Works fine, costs almost nothing.

Warning Signs

• Cramping that won't release — likely sodium, not magnesium
• Sloshing stomach — drinking too much, too fast, without electrolytes
• Headache during or after — possible hyponatremia, especially if you only drank water

Dubai's heat doesn't forgive. Get your individual numbers, build a protocol around them, and stop guessing.